BATTALION AND REGIMENTAL leaders unsheath sabers for the issuance of shouted orders, and as drum and bugle corps thump and shrill, a great mass, 4,000 strong, moves into its mess hall of thick overhead beams below vaulting ceiling heights and the size-of-a-house painting of history’s groupedtogether Great Captains: Richard the Lion-Hearted on his charger, Joan of Arc, Napoleon, Alexander, Grant, the rest.